Neither Harrison nor the Lions have publicly commented on his illness, but a brain tumor would likely sideline him for the rest of the season.

Harrison joined the Lions as a free-agent this off-season after spending a year with the Philadelphia Eagles. The former Washington State running back had his best season with the Cleveland Browns in 2009 when he rushed for 286 yards and three touchdowns in one game -- good for third all-time for a single game.

In an attempt to prevent the person from committing suicide, Avleen K. Mokha in her Facebook post wrote, "Don't go ahead with this tonight. There's more in life to look forward to beyond tonight. Please be there to see it."